Shift Endurant to be subclass of UcoThing

This covers the potential for Qualities (under proposal in Issue 535),
which in multiple foundational ontologies are acknowledged as endurants,
but in UCO would be inherent characterization things.

No effects were observed on Make-managed files.

References:
* #535
* #544

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

ontology/uco/core/core.ttl

@@ -183,7 +183,7 @@ core:Endurant
 		owl:Class ,
 		sh:NodeShape
 		;
-	rdfs:subClassOf core:UcoObject ;
+	rdfs:subClassOf core:UcoThing ;
 	rdfs:label "Endurant"@en ;
 	rdfs:comment "A UcoObject that endures in time and may change qualitatively while keeping its identity. Also termed 'continuant' in the philosophical literature."@en ;
 	dct:description "Examples include: ordinary objects of everyday experience, such as a person, a house, and a car; reified relationships, such as a marriage, a rental contract, and a person's love for another; and existentially-dependent aspects of objects, such as a car's weight, a person's language skills, and a house's color."@en ;
@@ -303,7 +303,10 @@ core:IdentityAbstraction
 		owl:Class ,
 		sh:NodeShape
 		;
-	rdfs:subClassOf core:Endurant ;
+	rdfs:subClassOf
+		core:Endurant ,
+		core:UcoObject
+		;
 	rdfs:label "IdentityAbstraction"@en ;
 	rdfs:comment "An identity abstraction is a grouping of identifying characteristics unique to an individual or organization. This class is an ontological structural abstraction for this concept. Implementations of this concept should utilize the identity:Identity class."@en ;
 	sh:targetClass core:IdentityAbstraction ;
@@ -314,7 +317,10 @@ core:Item
 		owl:Class ,
 		sh:NodeShape
 		;
-	rdfs:subClassOf core:Endurant ;
+	rdfs:subClassOf
+		core:Endurant ,
+		core:UcoObject
+		;
 	rdfs:label "Item"@en ;
 	rdfs:comment "An item is a distinct article or unit."@en ;
 	sh:targetClass core:Item ;

ontology/uco/location/location.ttl

@@ -90,7 +90,10 @@ location:Location
 		owl:Class ,
 		sh:NodeShape
 		;
-	rdfs:subClassOf core:Endurant ;
+	rdfs:subClassOf
+		core:Endurant ,
+		core:UcoObject
+		;
 	rdfs:label "Location"@en ;
 	rdfs:comment "A location is a geospatial place, site, or position."@en ;
 	sh:targetClass location:Location ;